Safety attachment for punch presses



W. A. BROWER.

SAFETY ATTACHMENT FOR PUNCH P RESSES.

APPLICATION FILED 14110.21, |92|.

1,418,525. PatentedJune 6,1922.

3 SHEETS-SHEET I- an, 7km MM/rmw K (tawny E L a w! A: SAFETY ATTACHMENT FOR PUNCH PRESSES.

APPLICATION FILED AUG-21, 192].

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"A Hill. M 8 H.- II H lI J/J W. A. BROWER.

PatentedJune .6, 1922.

3 SHEETS-SHEET 3- Skuuvwkw UNIT s rf-ares" raiser 1 orr cu. i, I

wILL s axssaw'm, or AnR'iAn, MICHIGAN, ism-(N R 'ro (e nent-meme.

LIABILITY COMPANY, or nn'rnom v rcnrean, ACORPORATIQN or ivrrorrrean. r

'SAFETY AT AGHMENT FOR rune mes s.-

To all whomz't mayconc'ern:

' Be it known that I, lVILLIS A.Bnownn,la 1 citizen of the United States of America,'Ire=-' siding at Adrian, in the county of Lenawee and State of Michigan, have invented oer-- tain new and usefullmprovements in Safety- Attachments for PunehPresss, of whichv member of the attachment being likewise and also in the connected *s1ots17and' 1 8 of the following is a specification, reference being hadtherein to the-accompanying drawlugs. v o

' Thisinvention relates to safety attaeh-. ment for punch presses, and it is the object of the' invention to provide a punch press with a guard member" which is required to engage the table ofthe press prior to operation of the punch so that'the operator is not permitted toplace his hand in the pathq'of the punch during the} down-stroke: thereof. The object of the invention is furthermore to; so arrange and; actuate. the guard that. it will engage the operators hand if the latter is in the path ofthe punch, being prevented by such engagementfrom being loweredoto, its'protective position and consequently, preventing release of the punch actuatingmechanism. I f

A: preferred embodiment of the. invention, is hereinafter described and is illustrated in the-accompanying. drawings, wherein:

,,,Figure 1 is a view in side elevation. of a punch press. equipped with-the improved protective attachment; the ."pu-nch being shown in its-raised position,-'and the/guard:

raised; a. 5 l v Figure Qisa similar view ofa press show-f ing the guard memberloweredi -preliminary': toagstrokeofthepunch- F igure3is a similar-view showing the position of the press during theinitial por-- tion of theup-strokeof the punch;

Figure 4 is an enlargedviewTof a portion of the mechanism asshow'n in Figure 1; t Figure 5 is a similarview ofthe sam mechanism as shownvin Figurey2gh v 9 Figure 6 ,is "a vertical sectional" view taken -on'line 6+6 ofFigure 5;; Figure 7 is a detail? perspective view of the guardmemben,

In these views, thereierence character 1" designates the table of a punch press, and 2 the'rotativetripping wheel controlling the l i punch 3, said wheelbeing operated by'any' A suitable clutch mechanism (not shown) The wheel/has a-p'eripheral cam'portion 2 I Specification ofiLetters I atent Application filed mam, 1921. Serial o. 495 9152. I i

one end of which forms aradial shoulder] 2 engageablebya dog 2-.to normally maine tain theira'ised position ofthe punch. 14 1s a guard member carriediby the forward end of an arm 5,'th'e rearend ofwhich arm is secured to a rockerdisk 6, pivoted at? upon the s't'andard 8 oflthe press, The mechanism- I of theprss f (not'show'nin detail) is'con-f trolled by- 'a foot "lever" 9 pivoted upon j the base portion of the "standardfSu The arm-o which "carries the guard meinber is vvintermediately pivotally engaged at "10' 5 by the forward end offa swingingjliiik bar1O the rear end of which'i's connectedto thelower entremity of a tripr'elease' bar 12by a pivot' pin 13, Anoper'ating connection is estab,-

lished" between the 'foot'lever '9' and the members 10" and 12 by a pull-rod lengaging" said pivot pin'.'- The trip' release bar 12=is pivoted at its upper end to said jdog 2 which controls the operation of the punch through engagementwith the trip'wheel2.""16 is a disk p'arallel and adjacent to the disk 6 substantially radial slot 118, the latter bepin 13 1 when the guard is engaged with the table 1. Said pivot piniengagesflin in yext n'ded inwardlyirointhe forward" end-of the slot 17 and being so positioned as to 'substantiallyf-register with the "pivot a substantially "radia1s1ot'19 in the disk 6,

the disk-16, being maintained; in the normalv position of theartsshown in Figs;v 1' and 4') in the 'rearend' of said slot 17 When the'foot lever9' is depressedpthe disk 6 is' thereby rocked, through the link let, swing- K ingthe'arm 5 downwardly and lowering theguard 4, and also registering the radial slot "in said disk "and pin 13 engaged" in said; slot 'with'the radial'slot-1 81in the-disk; 16; asthe When the radial: slots 18 and 19 5 are in the described registering-relation further-down uard member l is engagedrwiththetable 1;- l

ward actuation of. the 'foot lever 9 moves thef-j 1 pivot-pin 13 radially 'inward' in saidyslots 18 and 19, shifting the release'bar-l2 downl I wardly, disengaging the dog 2 HIT-0111 the shoulder 2 ofthe .trip wheel 2, andlinitiating the down-stroke of the punch; -During said stroke theaguardvme'mbere is lockediin en gagement-with the table 1 by engagement of the pin 13 in the slot 18, such'engagement preventing the rotation of the disk 6,.requisite to raise the arm 5.

. wheel 2 has rotated sufliciently to carry the ferential slot 17.

cam portion 2 clear of the dog.2, allowing 5 to raise said arm and the guard 4 after and14: has been established.

mally lock said trip release bar against. re-

sequently shifting said pin and the tripre-v the normal position of the parts 9, 10, 13 q It is to be noted that the rod 12 is locked in raised po- 'sition until the guardhas again been lowered.

. What I claim as. my invention is;

' 1. In a safety attachment-for 1113011111855, thelcombination with thetable of a machine and atoolmovableto and from said table, of atrip mechanism controllingsaid movementof the tool, a guard member for said tool, a pivotal arm carrylng said guard mem-.

berhaving alateral extension from its pivotal end slottedysubstantially in the direction of the pivot, a trip release bar actuable toward the pivotal end of said arm to effect;

release of saidtripmechanism, a pin carried by said barandengaging in said slot, a stationary abutment engaging said pinbetween the same and the pivot of said arm to norleasing movement, and means engaging said pin for rocking said arm to lower the guard to its protective position and thereby shift said pin clear of said abutment, and for sub lease bar toward the pivot of the arm to reber formedwvith a slot describing an arc lease the trip mechanism.

2. In asafety attachment formachines,

the combination with thetableof a machine and; a tool movable to and from said table,. of a trip mechanism controlling said movement of the tool, a guard member for the tool, an'p arm carrying said guard member having a lateral extension from its pivotal end slotted substantially in the direction of the pivot, a trip release bar actuable toward the pivotal end of the arm to effect release of the-trip mechanism, a pin carried by said-bar and engaging in said slot, a stationary mem-,

about the pivot of said arm and having an extension atone end: substantially toward said-pivot, and means engaging saidpinfor initially'rocking said arm to lower the guard g to its protective position and through said initial 1 rocking of the arm registering "the slotther'eofwith the similar slot of said statloiiarymem-ber, and for subsequently shift? Said pin cannot, escape from said slot until the tripping ing said pin in the registered slotstoward the pivot of said arm and thereby actuating the trip release bar to release position.

8. In a safety attachment for machines,v

the combination with'thetable of a machine and a tool movable toand from said table, of a trip mechanism controlling said movement of the tool, a guard member for the tool, an arm carrym'g said guard member having a lateral extension from its pivotal end slotted substantially in the direction of the pivot, a trip release bar actuable-toward thepivotal end of the arm to effect release of the trip mechanism, a pincarried by said bar and engaging in said slot, a link' extending from said pin to an lntermediate-portlon of said arm, a stationary abutment engag ng between said pin and the pivotal end of thearm infthe' normal position of the parts, re-

straining said triprelease bar againstrepin for rocking said arm to lowerthe guard to its protective position, while shifting said pin clear of said abutment, and subsequently a shifting said pin'and the-trip release bartoward the pivot of, the arm to actuate the release bar to release position.

4:. In a safety attachmentfor-machines,

the combination with thetable of a machine andva tool movable to and from said table, of

leasing movement, and means engagingsaid a trip mechanism controllingsaid movement i of the tool, a guard memberfor the tool, an arm carrying said guard member having a v lateral extension from-its pivotal end slotted:

substantially in'the direction of the pivot, atrip release bar actuable toward the pivotal end of said arm to effect release ofthe trip mechanism,'a link through" which said; release bar and said arm are actuated, a pin pivotally connecting said link to the release bar, a stationary abutment engaging inthe normal position of the partsbetween said pin and the pivot of. the arm and normally? restraining the release bar against releasing movement, and means for actuating said" link to rock said arm to initially lower the.

guard member andshift saidpin 'clear of said abutment, and to subsequently actuate said pin and the release bar toward the pivot release bar. a 1

of the arm to establish-release position of the 5. In a safety attachment for machines,-' the combination with the table of a machine and a tool, movabletoward and, awayfrom said table, of a trip mechanism controlling the movement of said tool, a; trip release bar" movable longitudinally to efiect release of said trip mechanism, a guard for said tool movableadjacent to said table, a rotatable member carrying said guard and controlling the longitudinal releasing movement of said trip release bar means-"for normally locking said trip release bar from longitudinal releasing movement, and means engagmg said trip-release bar for rotating said guard car-' rying member to'move said guard adjacent to said table and to release said trip release bar from said locking means and for subsequentl moving said trip release bar longitudina ly to release said trip mechanism.

' 6. In a safety attachment for machines, the combination with the table of a machine and a tool movable to and from said table, of a guard member for said tool,- a tripping wheel and coacting dog controlling operation of said tool, said wheel having a cam portion terminatin in a shoulder'normallyengaged by said cog to restrain the tool from operation, and a common means for shlftmg sald guard to protectlve position adjacent said table and for subsequently the combination with the table of a machine,

engaging said shoulder, a guard member for withdrawing said dog from said shoulder of the tripping wheel, the cam portion'of said wheel being engaged by said dog during the succeeding stroke of the tool to lock the guard in protective position. i

7. In a safety attachment for machines,

and'a tool movable to and from said table, of a Wheel having a peripheral cam portion provided at one end wlth a shoulder, a dog said tool, and means ior lowering said guard member and subsequently actuating said dog to permit saidjtool. to 'move downwardly, said means cooperating with said dog for locking said'guard member in a lowered position during the entire movement of said tool. Y 8.-In a safety, attachment for machines, the combination with the table of a machine and a tool, movable toward and away from said table, of a trip mechanism controlling .the movement of said tool, a trip release bar for effecting release of said trip mechanism,

movement, and means engaging said trip guard c'arryrelease bar for actuating sai ing' member to move said guard adjacent to said table and toreleasesaid tri release bar from said locking means and for subse- 40 3 a guard for said tool movable adjacent: to

quently moving said trip releasev bar' to re lease said trip mechanism.

In testimony whereof I afiix my signature.

v winnrs A. BRoWnR. v 

